645133060523 has 12 divisors (see below), whose sum is σ = 783089643600. Its totient is φ = 528928967952.

The previous prime is 645133060519. The next prime is 645133060543. The reversal of 645133060523 is 325060331546.

It is not a de Polignac number, because 645133060523 - 2² = 645133060519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645133060543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286215848 + ... + 286218101.

It is an arithmetic number, because the mean of its divisors is an integer number (65257470300).

Almost surely, 2^645133060523 is an apocalyptic number.

645133060523 is a deficient number, since it is larger than the sum of its proper divisors (137956583077).

645133060523 is a wasteful number, since it uses less digits than its factorization.

645133060523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572433986 (or 572433979 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 645133060523 in words is "six hundred forty-five billion, one hundred thirty-three million, sixty thousand, five hundred twenty-three".